Reciprocatory piston and cylinder machine

Details Reciprocatory piston and cylinder machine Reciprocatory piston and cylinder machine

1986-01-21

1987-10-13

Husar, Cornelius J.

Pumps

Successive stages

Reciprocating rigid stages

417443, 417DIG1, 92248, F04B 2500, F16J 102

Patent

active

046995722

ABSTRACT:
A reciprocatory piston and cylinder machine particularly suitable for use as a vacuum pump includes a cylinder (17), a cylindrical piston (16) relatively slidably reciprocable within the cylinder (17), and means for substantially sealing the annular space between the piston (16) and cylinder (17) in lieu of oil or other liquid lubricant. The sealing means comprises a sleeve (102) of a low-friction material disposed under circumferential tension, and preferably also under longitudinal tension, on the cylindrical surface of the piston (16). Also disclosed is a reciprocatory differential piston and cylinder machine of particular prior construction having a one-way valve (42) in an exhaust port (30) ahead of a head portion (24) of the piston (16). The arrangement is such that, as the front face (28) of the piston head portion (24) approaches the cylinder end face (52), the front face (28) physically moves the one-way valve (42) so as to open the exhaust port (30).

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